Rotax 912 ULS - Fretted CrankCase

To revive a very old thread…

It appears I have the dreaded crankcase fretting in the 912ULS in my SkyRanger. It has 600 hours. I’m going to check the serial numbers to see if it was part of the problem batch.

It’s a shame, because it runs beautifully. It just spits out a quart of oil every 30 minutes!

What’s the most practical and economical fix? I think I already know the answer, and my wallet doesn’t like it!

I had a 2000 912ULS with over 900 hrs of trouble free operation.

Have the engine (& rest of aircraft) checked over by a genuinely knowledgeable person - worth the fee!

That’s a lot of spitting. My fretted crankcase was cracked and making oil bubbles so I got the new crankcase. If the “spitting “ is out of the oil tank vent line, perhaps it is overfilled.